Answer
Runs after binding and before action execution. Uses data annotations, custom validation attributes, and IValidatableObject. Validation results go into ModelState and must be checked before using the data.
Quick Answer
Data annotations on model properties define rules: [Required], [StringLength(100)], [Range(1,100)], [EmailAddress]. ASP.NET Core runs these after binding and populates ModelState. if (!ModelState.IsValid) return BadRequest(ModelState) returns 400 with validation errors. Custom attributes inherit ValidationAttribute for complex rules.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ